Function readMessages(from ROS toolbox) can't read message type "nmea_msgs/Sentence".
5 views (last 30 days)
Show older comments
To reproduce this BUG:
>> bag = rosbag('any bag contains nmea sentence')
>> nmea = select(bag,"MessageType","nmea_msgs/Sentence")
>> readMessages(nmea,3)
When using readMessages, no matter which row you try to read, you will get this error:
Reference to non-existent field 'Sentence_'.
Error in ros.BagSelection/copyFromStruct (line 661)
cobj.(fc) = objArray(:);
Error in ros.BagSelection/getClassFromStruct (line 630)
ros1msg{k,1} = obj.copyFromStruct(ros1msg{k,1},msgStructs{k});
Error in ros.BagSelection/readMessages (line 275)
msgs = obj.getClassFromStruct(msgStructs);
0 Comments
Answers (1)
Karthik Reddy Vennapureddy
on 29 Mar 2021
Hello Kevin Tarn,
Thanks for reporting the issue. May I know which version of MATLAB are you using? Here are the quick workarounds, which can circumvent this error.
workaround 1: you can try to use 'DataFormat', 'struct' options to read messages from the bag file. I would recommend changing the following line
readMessages(nmea,3)
to
readMessages(nmea, 3, 'DataFormat', 'struct')
This reads messages much faster compared to reading class objects.
workaround 2: If you do not want to use 'DataFormat','struct' options for reading messages, please reach out to Tech Support team.
Thanks,
Karthik Reddy
See Also
Categories
Find more on Network Connection and Exploration in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!